The Top Tier of AMSOIL Synthetic Motor Oil. AMSOIL Signature Series Synthetic Motor Oil delivers extraordinary lubrication in all types of automotive gasoline engines. Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world's best motor oil. The result: engine protection that blows the doors off the highest industry standards.

• 50% more cleaning power vs. AMSOIL OE Motor Oil
• Ideal for turbos & direct injection
• Guaranteed protection for up to 25,000 miles or 1 year

Package sizes include:

Quart Bottle
Gallon Bottle
30-Gallon Drum
55-Gallon Drum

Product Code: azo •
Brand: AMSOIL

Product DetailsTech DataReviews & RatingRelated Videos

Product Applications
AMSOIL Signature Series Synthetic Motor Oil is excellent for use in all types of gasoline-fueled vehicles. It is recommended for all domestic and foreign vehicles requiring any of the listed performance specifications:

AMSOIL, the leader in automotive synthetic lubrication, produced the World's first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

Protects Against Engine Wear
AMSOIL Signature Series Synthetic Motor Oil develops a strong fluid film that keeps metal surfaces separated while its robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life. The Sequence IVA Engine Test, which must be passed to meet the industry-standard API SN specification, simulates extended periods of stop-and-go driving.

For 100 hours, the test engine cycles between 50 minutes of idling and 10 minutes of elevated rpm - conditions that encourage engine wear. The camshaft is then measured for wear in 84 locations and an average score is determined. We used Signature Series 0W-20, the lightest viscosity in the line, to further increase the severity of the test. AMSOIL Signature Series Synthetic Motor Oil provided 75 percent more engine protection against horsepower loss and wear* than required by the industry standard, extending the life of vital components like pistons and cams.

*Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.

Protects Pistons from Low-Speed Pre-Ignition (LSPI)
We armed Signature Series with an advanced detergent system that protects against harmful deposits and low-speed pre-ignition (LSPI). Most new engines feature gasoline direct injection (GDI), often combined with a turbocharger to boost power and improve fuel economy. These new technologies, when combined with a poorly formulated motor oil, promote LSPI and threaten engine operation. LSPI is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. It occurs in today's advanced engines and is much more destructive than typical pre-ignition.

Original equipment manufacturers (OEMs) like GM* have addressed the issue by designing tests to determine a motor oil's ability to prevent LSPI. The GM test allows up to five LSPI events to receive a passing score. Signature Series Synthetic Motor Oil provided 100 percent protection against LSPI* - zero occurrences were recorded.

Protects Turbochargers
Our unique synthetic formulation is inherently stable to resist oxidation and neutralize acids. Signature Series Motor Oil provides outstanding protection against deposits common to high-temperature engine environments. The tremendous heat and stress turbos create can cause some oils to break down and form harmful bearing deposits through a process known as turbo coking. Over time, turbos can suffer reduced performance or fail altogether.

We challenged Signature Series to the GM Turbo Coking Test, which consists of 2000 cycles of extreme heat soaks. An oil must limit the temperature change within the turbocharger to 13 percent or less to pass the test. Signature Series limited the temperature increase to only 3.6 percent, protecting the turbocharger 72 percent better than required* by the GM dexos1® Gen 2 specification.

Extends Drains: Protection GuaranteedAMSOIL Signature Series Synthetic Motor Oil provides reserve protection, allowing you to go longer between oil changes if you choose up to 25,000 miles, 700 hours of operation or one year, whichever comes first*. Our unique synthetic formulation and long-drain additive system are inherently stable to resist oxidation and neutralize acids over longer periods. Signature Series is designed to deliver outstanding engine protection, cleanliness and performance over extended drain intervals - guaranteed. It provides peace of mind so you can fit oil changes into your schedule.

Oil Filter:

Any brand of oil filter may be used with Signature Series Synthetic Motor Oil. For maximum convenience, however, use an AMSOIL Ea® Oil Filter. Made of fully synthetic media with greater filtering efficiency and dirt-holding capacity than conventional filters, Ea Oil Filters are recommended for 25,000 miles/12 months or 15,000 miles/12 months, depending on application, which coincides with Signature Series' once-a-year drain interval. While Signature Series' 12-month service life remains intact if a non-Ea Oil Filter is used, the filter must be changed according to its manufacturer's recommendations.

Trusted by Professional Engine Builders

Dedicated engine builders and mechanics put in long hours honing their craft. These architects of powerful, high-performance engines turn to Signature Series to protect their passion.

"When we use AMSOIL, I don't worry about a film breakdown or an oil breakdown - and the oil pressure is always consistent. We've tested oils back-to-back on the dyno in our shop and we're always able to make more power with AMSOIL."

Maximum Cleaning Power to Battle Sludge

Engine failures due to sludge are often caused by a plugged oil pick-up tube screen - the motor is effectively starved of oil. The Sequence VG Engine Test measures an oil's ability to prevent sludge. During the test, a Ford 4.6L engine is subjected to sludge-inducing conditions for 216 hours. The industry standard allows for 10 percent blockage before the motor oil fails the test. Signature Series produced a screen virtually free from sludge (see image). Its detergent and dispersant additives are so effective, Signature Series provides 90 percent better protection against sludge.

• *Based on independent testing of AMSOIL Signature Series 5w-30 motor oil, in the LSPI engine test as required for the GM dexos 1® Gen 2 specification.
• *Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
• *vs. AMSOIL OE Motor Oil
• *Based on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D6593 engine test for oil screen plugging as required by the API SN specification.
* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Preserves Horsepower
The extreme durability of Signature Series Motor Oil ensures your engine runs stronger, for longer. We installed Signature Series 5W-30 Synthetic Motor Oil in a Ford* F-150 with a new 3.5L Ecoboost engine to test its ability to protect turbocharged direct-injection (TDGI) engines from torque and horsepower loss during extended drain intervals up to 25,000 miles. Power sweeps were done at the beginning and end of the test to evaluate horsepower and torque retention. As the graph shows, Signature Series helped maintain engine performance throughout the 100,000 mile test.

Limits Oil Consumption
Signature Series has a uniform molecular structure that limits evaporation and keeps it where it's needed most - protecting your engine. Volatility (burn-off) occurs when oil gets hot, causing lighter molecules to burn off or evaporate. This leads to oil thickening, additive imbalance, higher emissions and oil consumption. The NOACK Volatility test is the industry standard for evaluating motor oil high temperature evaporation. It measures the percentage of burn-off after a motor oil is placed under constant airflow at 482°F for 1 hour. A lower number indicates a better resistance to evaporation. Signature Series falls far below the API limit for volatility, reducing the need for frequent oil top-offs and limiting vehicle emissions.

Maintains Protective Viscosity
We formulated Signature Series with superior thermal durability that resists breakdown better than conventional and synthetic motor oils. The Sequence IIIH Test uses the Chrysler 3.6L Pentastar engine to evaluate a motor oil's ability to resist the damaging effects of heat. The test is conducted with oil temperatures of 304°F, 100°F hotter than normal operation, to accelerate oil thickening and deposits. Despite the extreme conditions, Signature Series kept pistons clean and held thickening to only 6 percent, a minimal amount compared to the proposed specification limit of 150 percent*. This stay-in-grade performance helps maintain maximum power and fuel economy while also ensuring advanced technologies like variable valve timing (VVT) operate as designed throughout the entire drain interval.

• *Based on proposed ILSAC GF-5 Plus specification.
*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

SERVICE LIFENormal Service: Up to 25,000 miles, 700 hours of operation or one year, whichever comes first, in personal vehicles not operat-ing under severe service.

COMPATIBILITY

AMSOIL Signature Series Synthetic Motor Oil is compatiblewith other conventional and synthetic motor oils. Mixing other oils with AMSOIL motor oils, however, will shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Excellent Oil

I have used Amsoil since 1980 in all my cars and small engines. All have worked like new and nothing I own using Amsoul has ever had an engine related issue to to excessive wear or reliability.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

January 21st, 2018 at 8:38 am

Reviewed by Jeff:

Great Oil.

I have used this oil for 4 years now in my 2005 F150. Each December I change the oil myself and send samples to Blackstone Labs for analysis. Each time it has come back, saying I can extend my oil changes another 5K+ miles because the TBN is great. Has always been over 2. The most I have driven in any 1 year period before changing oil was 14K miles. I'm impressed.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

January 18th, 2018 at 12:08 pm

Reviewed by Rick:

Nothing but AMSOIL

Started using over fifteen years ago. First in my motorhome. Was told it could increase my MPG. It did by 2 miles to the gallon. In a motor home that's a lot. I have been using it ever since in anything that burns fuel. Love all their products.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

November 27th, 2017 at 8:49 am

Reviewed by david:

Amsoil is great

Use amsoil on my ecoboost Never had a problem with timing chain and used it on my wife's 2008 ford explorer with the 4.0 no engine problems and it has 200,000 miles

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

November 9th, 2017 at 1:44 pm

Reviewed by Mark:

The oil to use

Have used Amsoil Signature Series for a decade now.Last oil report stated the engine at 76000 miles is "ageing like a fine wine".Also use the 2 cycle oil & it's great!

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

October 26th, 2017 at 11:15 pm

Reviewed by Butch:

I've used this product for the last ten years!

I have been using 0W-30 Amsoil Signature Series since about 36,000 mlies on my 2007 F150 along with Amsoil oil filter. 281,000 miles and still running great. Excellent power and good fuel mileage. Of course I also do the other routine maintenance as well. People can't believe how quite it runs and still has good power. Amsoil is fantastic.. Engine still good and tight, no oil leaks!

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

October 17th, 2017 at 2:16 pm

Reviewed by Matt:

Good stuff

Amsoil products are the best.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

October 1st, 2017 at 6:13 am

Reviewed by dhg-guy:

Will continue to buy this product

Used in my f150 ecoboost engine, makes it run smooth, cool, quiet.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

September 14th, 2017 at 3:16 pm

Reviewed by ConBro:

Great for Subaru's

Use this in the wife's Subaru Legacy. Used 44k exclusively and the UOA's are perfect every time. Can't recommend enough.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

September 9th, 2017 at 3:17 pm

Reviewed by Jon:

Great oil

I've had great results with Amsoil both on track and on the street. Love them.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 21st, 2017 at 4:23 pm

Reviewed by Brayden:

Low Milage Yearly User

The recommended Dexos1 oil for my turbocharger car is 5W30. Amsoil is one of the few (only) companies who offer a high quality 0W30 that is Dexos1 certified. Disclaimer, I have no interest in using 'house brand' for my car. Personally I believe aftermarket manufacturers like Amsoil have more incentive to keep my vehicle lasting longer. I have the luxury of not having to drive my car to work, so the annual mileage is well below average. My car also sits for weeks on end and having the lighter oil helps to quickly lubricant my engine when I start it for the first time. I change the oil once a year instead of the kilometres. Choosing the lighter oil increased fuel economy in the summer and allowed easy starting in the winter on those -35°C days (no block heater). In the winter I enjoy skiing in the mountains so I need an oil that stays fluid in extreme cold. On a hot summer day in stop/go traffic I feel confident running the lighter 0W30 oil in my car knowing that my engine is protected. Overall great product and will continue to use 0W30 Signature Series for years to come.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 13th, 2017 at 6:05 pm

Reviewed by JK:

I would buy this product again

Use in a 14 year old truck, no tapping when truck is started after sitting for days

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 13th, 2017 at 3:21 pm

Reviewed by Scott L Rising:

Oil

Great oil wish it were a little cheaper

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

July 23rd, 2017 at 10:55 am

Reviewed by Mt:

Great

works great

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

June 26th, 2017 at 1:31 pm

Reviewed by Chuck:

Great oil

Have used Amsoil for the past 15 years. During that time, it has never let me down. Early on, I had oil analysis done and the oil held up extremely well going over 20,000 real miles and still had life left.You can't ask more then that especially in a dusty environment.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

June 22nd, 2017 at 10:44 am

Reviewed by Pat:

Excellent

oil changes

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

June 13th, 2017 at 10:45 am

Reviewed by Voo:

Best product on the market as far as lubrcation.

I use amsoil on all my cars weather it is brake fluid, trans. power steering and anti freeze.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

May 20th, 2017 at 1:42 pm

Reviewed by Florin:

AMS and nothing else

If you look for quality, performance, fuel economy and peace of mind, don't bother to look elsewhere.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

May 20th, 2017 at 9:41 am

Reviewed by BL:

Amsoil all the way!

I use 0-30 in both of my Honda autos. I switch to 0-30 in the summer and 0-20 in the winter. I have 50k mi on the motor in my Ridgeline and it runs just as good as when I bought it.

I would not use any thing else.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

May 15th, 2017 at 10:35 am

Reviewed by mike:

great product, i trust this oil

only oil I use in my cars and motorcycles.........

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

April 18th, 2017 at 2:52 pm

Reviewed by Turtle Man:

GREAT OIL OF THE 30 VISCOSITY RANGE

The AMSOIL package included in this oil is great. When uses as directed, it provides the longevity and dependability surpassing the temperature range of use compared to 5w-30 and 10w-30 engine oils. Use of this in both vehicles for many years, truck and car, that require a 5w-30 engine oil. Thanks again.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

April 15th, 2017 at 2:03 am

Reviewed by Joe:

Your car is worth big bucks

your car was expensive don't scrimp on the oil amsoil oil and filters

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

February 26th, 2017 at 12:30 am

Reviewed by squire:

Best oil ever!!!

I've been using Amsoil for years. I really like using the signature series 0-30 in my engines for quick starting in frigid weather!

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

February 25th, 2017 at 10:55 am

Reviewed by Voo:

I Buy nothing but Amsoil products

Like my title everything that goes into both my cars is amsoil products oil-brake-trans-power steering etc.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

February 14th, 2017 at 11:29 am

Reviewed by Pa:

Signature Series 0W-30 AZO Versatility

Using Signature Series 0W-30 AZO keeps my ordering simple. At one time I was using 5W-30, 10W-30, 10W-40, 5W-40 European Amsoil products. There was a time in the past years that the "Look Up A Vehicle" applications commonly listed the AZO as the first listed oil as the top recommendation. After comparing specs I concluded that the vehicles using the 40 weight products didn't really need that viscosity per the owners manual and the other 30 weight oils could all be well serviced by the 0W-30 Signature Series. It is a great product and I use it in all the vehicles I own and the family vehicles I service.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

February 12th, 2017 at 6:19 pm

Reviewed by Gio:

I always buy nothing but amsoil

I've been useing amsoil oils for 20 years I wouldn't use another brand if I was stuck out of oil somewhere

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

February 11th, 2017 at 10:39 am

Reviewed by Harry:

0W-30 SIGNATURE SERIES OIL IS AWESOME!

I highly recommend the AZO 0W-30 Signature Series oil. I have been using it since it came out and the 0w-30 SSO oil before that. This top of the line oil has kept my car running young, now at 449,000 miles.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

January 4th, 2017 at 12:01 pm

Reviewed by Tony:

Gatortail

My order arrived on time and un-damaged. I use Amsoil in my Gatortail engine (Briggs) replacing the oil at 25-35 hours with a total of 550 hours on the engine. The oil holds up very well. When conducting maintenance on the engine the interior working parts of the engine are like new with absolutely no visible signs of sludge build up. I highly recommend the use of Amsoil products. I also use the Amsoil Marine Grease in the lower unit and that product holds up very well as well.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

January 1st, 2017 at 9:59 am

Reviewed by Andrew:

Good stuff

I love Amsoil products. I run this in a 1993 Ford Ranger. With 245k on the motor it still works good and plan on running it for a while. No tapping on start up like other oils. I do alot of short trips with this truck and put alot of hard miles on it, this oil is up to the task.

Easier cold start and better fuel economy.

For me it's the BEST!

I use SS 0W-30 in my daily driver '06 Mustang. Change interval once a year with an Amsoil filter. The oil flows like water but slippery to the touch. When the engine idles all you hear is the muted sound of wet valves, and when I punch it all you hear is pure muscle; no pings, no knocks, just a well oiled machine!That car sees only Amsoil products and has 86000 miles on it. I have never had to add a single drop of oil to the engine between oil changes, ever. Every week when I pull the dip stick the same 2 punch holes are wet with oil . . . i rest my case, this is good stuff!

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

December 22nd, 2016 at 1:42 am

Reviewed by Robert:

I think it's an outstanding oil for cars with a blower

I have a nearly 600hp 03 mustang cobra. Based on the used oil analysis I've done over the past 3 yrs, I've gone almost 6000 miles one interval and the oil didn't shear. I don't know if this makes the 0w-30 SS an outstanding oil vs other off the shelf oils, but I do know that high horsepower applications pls e greater stress on motor oils. So extract from my review, what you wish.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

December 20th, 2016 at 12:41 pm

Reviewed by Jay:

There's not another Oil for Me ! AMSOIL MAN FOREVER!

I've been using Amsoil for over 25 years! I use 0-30 Signature Series in my 2011 Subaru OutBack since the first oil change! 175,000 miles now & still Purring like a Kitten! Also running in my wife's new Xfinity Q60L !

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

December 17th, 2016 at 2:08 pm

Reviewed by Larry:

Great product

The 0-30 works well in my old Dodge and I plan on using it from now on.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

September 12th, 2016 at 2:42 pm

Reviewed by Danjp1975:

Piece of mind

I travel a lot every week. I usually drive over a thousand miles each week so I don't need to be getting ripped off in quick change places. I don't really keep track of how many miles I go in between changes any more and I've had no engine issue that relate to wear. This product performs as advertised.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 30th, 2016 at 4:08 am

Reviewed by Mike:

Nothing but Amsoil for my Mazda3

I bought this car used - it's a 2008 Mazda3 S - from my best friend, so I knew its full history already. He's run Amsoil in it since brand new, and I plan to continue the same. It just rolled over 200,000 miles last week, and mechanically, the car has been in the shop twice in its lifetime - both for air conditioner issues. It doesn't burn or leak oil, and never has. When something is treating you this well, why would you switch to anything else?

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 29th, 2016 at 11:56 pm

Reviewed by Steve The 'G' Man:

Superior Product !

The Best Engine Protection on the Market ! I drive a 2012 Toyota Camry & The Manufacturer recommends 0-20 Weight Oil..... which is supposed to provide engine protection up to 100 Degrees. Well I live in Las Vegas Nevada where Summer Temps can reach 117 Degrees..... The signature Amsoil 0-30 is far more protection

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 29th, 2016 at 6:06 pm

Reviewed by pappy:

great oil

i've been using this oil for many years and i am completely satisfied with it.i actually gained about 2-3 miles more per gallon of gas.i usually change this oil and filter every 8-10,000 miles and when i do it is never black.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 29th, 2016 at 11:49 am

Reviewed by lynn:

i lov how it make my car run better

love this product

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

August 29th, 2016 at 11:35 am

Reviewed by Alvin Chen:

2013 Chev Equinox 3.6L

After some research I decided to run 0w30 instead of the recommended 5w30. This was to gain some additional mpg. I chose Ams oil since this 0w30 is rated for GM dexos1.

This is the first time using Amsoil, engine got smoother & getting over 60 miles more per tank of gas. I assume the lower viscosity and the quality of oil are both contributing to better gas mileage. This saves a lot now, so will continue to use this brand.

Item Reviewed: Signature Series 0W-30 100% Synthetic Motor Oil (AZO)

July 24th, 2014 at 7:15 pm

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